1 /*
2 * Copyright (c) 2004, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "gc/shared/barrierSet.hpp"
28 #include "gc/shared/barrierSetAssembler.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "prims/jniFastGetField.hpp"
31 #include "prims/jvm_misc.hpp"
32 #include "runtime/safepoint.hpp"
33
34 #define __ masm->
35
36 #define BUFFER_SIZE 30*wordSize
37
38 // Instead of issuing lfence for LoadLoad barrier, we create data dependency
39 // between loads, which is more efficient than lfence.
40
41 // Common register usage:
42 // rax/xmm0: result
43 // c_rarg0: jni env
44 // c_rarg1: obj
45 // c_rarg2: jfield id
46
47 static const Register rtmp = r8;
48 static const Register robj = r9;
49 static const Register rcounter = r10;
50 static const Register roffset = r11;
51 static const Register rcounter_addr = r11;
52
53 // Warning: do not use rip relative addressing after the first counter load
54 // since that may scratch r10!
55
56 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
57 const char *name = NULL;
58 switch (type) {
59 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
60 case T_BYTE: name = "jni_fast_GetByteField"; break;
61 case T_CHAR: name = "jni_fast_GetCharField"; break;
62 case T_SHORT: name = "jni_fast_GetShortField"; break;
63 case T_INT: name = "jni_fast_GetIntField"; break;
64 case T_LONG: name = "jni_fast_GetLongField"; break;
65 default: ShouldNotReachHere();
66 }
67 ResourceMark rm;
68 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
69 CodeBuffer cbuf(blob);
70 MacroAssembler* masm = new MacroAssembler(&cbuf);
71 address fast_entry = __ pc();
72
73 Label slow;
74
75 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
76 __ mov32 (rcounter, counter);
77 __ mov (robj, c_rarg1);
78 __ testb (rcounter, 1);
79 __ jcc (Assembler::notZero, slow);
80 if (os::is_MP()) {
81 __ xorptr(robj, rcounter);
82 __ xorptr(robj, rcounter); // obj, since
83 // robj ^ rcounter ^ rcounter == robj
84 // robj is data dependent on rcounter.
85 }
86
87 __ mov (roffset, c_rarg2);
88 __ shrptr(roffset, 2); // offset
89
90 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
91 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
92 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
93 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
94
95 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
96 speculative_load_pclist[count] = __ pc();
97 switch (type) {
98 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
99 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
100 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
101 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
102 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
103 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
104 default: ShouldNotReachHere();
105 }
106
107 if (os::is_MP()) {
108 __ lea(rcounter_addr, counter);
109 // ca is data dependent on rax.
110 __ xorptr(rcounter_addr, rax);
111 __ xorptr(rcounter_addr, rax);
112 __ cmpl (rcounter, Address(rcounter_addr, 0));
113 } else {
114 __ cmp32 (rcounter, counter);
115 }
116 __ jcc (Assembler::notEqual, slow);
117
118 __ ret (0);
119
120 slowcase_entry_pclist[count++] = __ pc();
121 __ bind (slow);
122 address slow_case_addr = NULL;
123 switch (type) {
124 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
125 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
126 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
127 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
128 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
129 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
130 default: break;
131 }
132 // tail call
133 __ jump (ExternalAddress(slow_case_addr));
134
135 __ flush ();
136
137 return fast_entry;
138 }
139
140 address JNI_FastGetField::generate_fast_get_boolean_field() {
141 return generate_fast_get_int_field0(T_BOOLEAN);
142 }
143
144 address JNI_FastGetField::generate_fast_get_byte_field() {
145 return generate_fast_get_int_field0(T_BYTE);
146 }
147
148 address JNI_FastGetField::generate_fast_get_char_field() {
149 return generate_fast_get_int_field0(T_CHAR);
150 }
151
152 address JNI_FastGetField::generate_fast_get_short_field() {
153 return generate_fast_get_int_field0(T_SHORT);
154 }
155
156 address JNI_FastGetField::generate_fast_get_int_field() {
157 return generate_fast_get_int_field0(T_INT);
158 }
159
160 address JNI_FastGetField::generate_fast_get_long_field() {
161 return generate_fast_get_int_field0(T_LONG);
162 }
163
164 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
165 const char *name = NULL;
166 switch (type) {
167 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
168 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
169 default: ShouldNotReachHere();
170 }
171 ResourceMark rm;
172 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
173 CodeBuffer cbuf(blob);
174 MacroAssembler* masm = new MacroAssembler(&cbuf);
175 address fast_entry = __ pc();
176
177 Label slow;
178
179 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
180 __ mov32 (rcounter, counter);
181 __ mov (robj, c_rarg1);
182 __ testb (rcounter, 1);
183 __ jcc (Assembler::notZero, slow);
184 if (os::is_MP()) {
185 __ xorptr(robj, rcounter);
186 __ xorptr(robj, rcounter); // obj, since
187 // robj ^ rcounter ^ rcounter == robj
188 // robj is data dependent on rcounter.
189 }
190
191 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native.
192 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
193 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow);
194 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);)
195
196 __ mov (roffset, c_rarg2);
197 __ shrptr(roffset, 2); // offset
198
199 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
200 speculative_load_pclist[count] = __ pc();
201 switch (type) {
202 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
203 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
204 default: ShouldNotReachHere();
205 }
206
207 if (os::is_MP()) {
208 __ lea(rcounter_addr, counter);
209 __ movdq (rax, xmm0);
210 // counter address is data dependent on xmm0.
211 __ xorptr(rcounter_addr, rax);
212 __ xorptr(rcounter_addr, rax);
213 __ cmpl (rcounter, Address(rcounter_addr, 0));
214 } else {
215 __ cmp32 (rcounter, counter);
216 }
217 __ jcc (Assembler::notEqual, slow);
218
219 __ ret (0);
220
221 slowcase_entry_pclist[count++] = __ pc();
222 __ bind (slow);
223 address slow_case_addr = NULL;
224 switch (type) {
225 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
226 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
227 default: break;
228 }
229 // tail call
230 __ jump (ExternalAddress(slow_case_addr));
231
232 __ flush ();
233
234 return fast_entry;
235 }
236
237 address JNI_FastGetField::generate_fast_get_float_field() {
238 return generate_fast_get_float_field0(T_FLOAT);
239 }
240
241 address JNI_FastGetField::generate_fast_get_double_field() {
242 return generate_fast_get_float_field0(T_DOUBLE);
243 }